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Optimal Design and Damping Performance Research of Suspension Structural System(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年01期
Page:
51-60
Research Field:
Publishing date:

Info

Title:
Optimal Design and Damping Performance Research of Suspension Structural System
Author(s):
TAN Ping1; 2; 3;  LAN Li1; 2; 3;  HE Hui1; 2; 3;  XIANG Yue1; 2; 3;  ZHENG Xiao-jun1; 2; 3
( 1. Collaborative Innovation Center for Earthquake Mitigation and Disaster Prevention of Civil Engineering, Guangzhou University, Guangzhou 510405, Guangdong, China; 2. Guangdong Provincial Key Laboratory of Earthquake Engineering and Advanced Technology, Guangzhou University, Guangzhou 510405, Guangdong, China; 3. Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education, Guangzhou University, Guangzhou 510405, Guangdong, China)
Keywords:
damping performance;  optimal design parameter;  performance index;  suspension structural system;  theoretical solution
PACS:
TU355
DOI:
10.19815/j.jace.2020.10067
Abstract:
The suspension structural system composed of suspension pendulum isolation system was investigated, and the two-degree-of-freedom mechanical model of the suspension structural system was established. The motion equations of the system were established according to the Lagrangian equations, and the theoretical expressions of the mean square values of displacement responses of both the superstructure and substructure under earthquake excitations were derived. By introducing the performance index and considering the displacement response of both superstructure and substructure, the performance objective function of the suspension structural system was then defined. Taking the minimum performance objective function as the optimization objective, the theoretical solution of the optimal design parameters of suspension structural system was derived, and the correctness of the theoretical solution was verified by analyzing the system parameters under different performance indexes. Finally, a two-story shear frame structure was taken as an example to analyze the seismic performance of the structure system. The results show that the optimal damping ratio is positively correlated with mass ratio, and the optimal frequency ratio is negatively correlated with mass ratio. With the increase of the performance index, the peak displacement response damping ratio of the superstructure increases, while that of the lower substructure decreases. But as long as the performance index is reasonable, the suspension structural system can effectively control the seismic displacements of both superstructure and substructure. In the case of the performance index equal to 1, the peak displacement of superstructure and substructure are reduced above 67.45% and 25.16%, respectively.

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Last Update: 2021-01-20